这个词是什么意思？
Positively-charged atomic nuclei that have been stripped of their electrons. These particles have one or more units of electric charge and a mass exceeding that of the Helium-4 nucleus (alpha particle).
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D020450 · MeSH 2026。
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